Jupiter was king of the Gods. The eagle was his messenger. His weapon was the Thunderbolt (thunder and lightning). All other gods were terrified of him, although he was a little scared of his wife
Juno! Jupiter, Neptune and Pluto were the three sons of Saturn. They divided up the world between themselves. Jupiter took the air, Neptune had the sea and Pluto ruled under the earth, the home of the Dead.

Jupiter means Father Jove (Father in Latin is "pater"). There was a big temple on the Capitol in Rome dedicated to Jupiter Optimus Maximus (which means Jupiter Best and Greatest). The Romans thought that Jupiter guarded their city and looked after them.